Electric discharge devices



March 31, 1959' F KU ;PP 2,880,350

ELECTRIC DISCHARGE DEVICES Filed April 29, 1953 fiLllllllllllllllllll/l/Jlll/l/l/lllll I Inventor G. F KLEFP Attorney United StatesELECTRIC DISCHARGE DEVICES George Francis Klepp, London, England,assignor to International Standard Electric Corporation, New York, N.Y.,a corporation of Delaware This invention relates to a construction ofelectric discharge devices in which a mica disc locating the electrodesis held out of contact and suitably positioned with respect to theenvelope of the device. This has been achieved previously by placing anumber of metal strips or wires attached to the mica disc and held intension against the envelope of the device.

The disadvantage of this construction is that the pressure exerted on asmall area of the disc by the wires is such that under conditions ofvibration the mica disc is caused to chip and crack and so allow thewires or strips, which are known as snubbers, to become loose. As aresult of this, the mica disc is able, under conditions of vibration, topound against the envelope and produce a dust which is detrimental tothe cathode emission.

According to the present invention an electric discharge devicecomprises an envelope, electrodes located with respect to one another bymeans of an insulating disc, a plurality of wire snubbers secured to theinsulating disc and pressing against the envelope to space the said disctherefrom, and means to increase the surface area of that portion of theinsulating disc upon which the pressure of the snubber acts, to preventthe snubber from causing damage to the insulating disc, said meanscomprising a tough rigid washer placed between each snubber and asurface of the insulating disc.

The washers need not be provided for each snubber, one washer may becommon to several snubbers, or a washer may be part of a valve componentserving some other purpose such as a capacitance end-shield. Washers maybe placed on either or both sides of the insulating disc as required.

An embodiment of the invention will now be described in conjunction withthe accompanying drawings in which:

2,880,350 Fatented Mar. 31, 1959 ice Fig. 1 shows a metal snubber spotwelded to a metal washer.

Fig. 2 shows in longitudinal section a method of attaching the assemblyof Fig. 1 to an insulating disc.

Fig. 3 is a plan view of an insulating disc with metal snubbers andwashers attached.

In Fig. l a metal snubber 1 is shown spotwelded at 2 to a metal disc 3.In Fig. 2 the snubber 1 and disc 3 are shown in section located on aninsulating disc 4. The portion 5 of the snubber 1 is later bent up intothe position shown by the dotted lines in order to fix the snubberfirmly to the insulating disc 4, and the other end of the snubber isshown pressing against an envelope 6.

In Fig. 3 the insulating disc 4 is shown in plan with four snubbers 1and discs 3 attached.

The snubbers 1 are shown pressing against envelope 6 shown in section,and electrode support rods 7 and 8 which support grid 9 and electrodesupport rods 10 and 11 which support grid 12 are shown projectingthrough the disc 4.

While the principles of the invention have been described above inconnection with specific embodiments, and particular modificationsthereof, it is to be clearly understood that this description is madeonly by of example and not as a limitation on the scope of theinvention.

What I claim is:

1. An electric discharge device comprising an envelope, electrodeslocated with respect to one another by means of an insulating disc, aplurality of wire snubbers secured to the insulating disc and pressingagainst the envelope to space the said disc therefrom, and means toincrease the surface area of that portion of the insulating disc uponwhich the pressure of the snubber acts, to prevent the snubber fromcausing damage to the insulating disc, said means comprising a metalwasher placed between each snubber and a surface of the insulating disc.

2. An electric discharge device as claimed in claim 1 in which the saidmetal washer is spot welded to the snubber.

3. An electric discharge device as claimed in claim 2 in which the saidmetal washer serves also as a capacitance end-shield.

Kahl July 28, 1936 O'Neill Dec. 15, 1936

